Un simulacro corto para ver cómo piensa el examen

Passage — Urban heat islands. Cities are consistently warmer than the countryside that surrounds them, a phenomenon known as the urban heat island effect. The usual explanation points to dark surfaces: asphalt and roofing absorb solar radiation and release it slowly through the night. Recent measurements, however, suggest that surface colour accounts for less of the difference than long assumed. In several mid-sized European cities, researchers found that the reduction of evaporative cooling — the loss of vegetation and standing water that would otherwise absorb heat as moisture evaporates — explained a larger share of the temperature gap than absorption by pavement. The finding does not overturn the older account so much as reorder it, and it carries an obvious practical implication: planting may cool a street more cheaply than resurfacing it.